Modeling and Optimization of Evacuated Tubular Solar Thermal Collector

2021 ◽  
pp. 90-120
Keyword(s):  
Global Solar Radiation ◽  
Solar Thermal ◽  
Thermal Systems ◽  
Modeling And Optimization ◽  
Tilted Surface ◽  
Solar Thermal Collector ◽  
Confirmatory Tests ◽  
Optimal Setting ◽  
Collector Efficiency ◽  
Simple Additive Weighting

Modeling and optimization of evacuated tubular solar thermal collector (ETSTC) is discussed using a modified simple additive weighting (M-SAW) method. To improve the system efficiency (η) and end day temperature (Tsfd), ETSTC parameter (i.e., start day temperature [Tsid], ambient temperature [Tad], global solar radiation on tilted surface [GT], and wind speed [Ws]) are optimized. The applied method is significantly improved the efficiency (η) and determined the best setting for ETSCT. Test no.10 is the optimal experimental trail run and corresponding collector efficiency is obtained as 43%. Further, experimental data are statistically tested via parametric, ANOVA analysis, and found satisfactory and acceptable. Last, confirmatory tests results show comparable and acceptable w.r.t. experimental results for the optimal setting obtained through proposed method. The proposed MCDM method can be recognized as potential use for modeling and optimization of other thermal systems.

Photovoltaic-Thermal Collector System for Domestic Application

Solar Energy ◽  
2005 ◽  
Author(s):  
T. T. Chow ◽  
J. Ji ◽  
W. He
Keyword(s):  
Energy Performance ◽  
Primary Energy ◽  
Heat Energy ◽  
Solar Thermal ◽  
Test Results ◽  
Thermal Systems ◽  
Collector System ◽  
Solar Thermal Collector ◽  
Reduced Temperature ◽  
Direct Attachment

Photovoltaic-thermal (PV/T) systems integrate photovoltaic and solar thermal technologies into one single system with dual production of electricity and heat energy. A typical arrangement is the direct attachment of PV modules on to a solar thermal collector surface. For a given collector surface area, the overall system energy performance is expected higher than the conventional “side-by-side” PV and solar thermal systems. In the development of PV/T collector technology using water as the coolant, the most common design follows the sheet-and-tube thermal absorber concept. Fin performance of the thermal absorber has been identified as one important factor that affects much the overall energy performance of the collector. Accordingly, an aluminum-alloy flat-box type PV/T collector prototype was constructed and tested. Our test results indicate that a high combined thermal and electrical efficiency can be achieved. The primary-energy-saving efficiency for daily exposure approaches 65% at zero reduced temperature operation. With a simple and handy design, the product is considered to be very suitable for domestic application.

Spatially Varying Extinction Coefficient for Direct Absorption Solar Thermal Collector Optimization

2011 ◽  
Vol 133 (2) ◽  
Author(s):  
Todd P. Otanicar ◽  
Patrick E. Phelan ◽  
Robert A. Taylor ◽  
Himanshu Tyagi
Keyword(s):  
Energy Conversion ◽  
Extinction Coefficient ◽  
Solar Thermal ◽  
Efficiency Improvement ◽  
Direct Absorption ◽  
Solar Thermal Collector ◽  
Solar Thermal Collectors ◽  
Collector Efficiency ◽  
Overall Performance ◽  
Spatially Varying

Direct absorption solar thermal collectors have recently been shown to be a promising technology for photothermal energy conversion but many parameters affecting the overall performance of such systems have not been studied in depth, yet alone optimized. Earlier work has shown that the overall magnitude of the extinction coefficient can play a drastic role, with too high of an extinction coefficient actually reducing the efficiency. This study investigates how the extinction coefficient impacts the collector efficiency and how it can be tuned spatially to optimize the efficiency, and why this presents a unique design over conventional solar thermal collection systems. Three specific extinction profiles are investigated: uniform, linearly increasing, and exponentially increasing with the exponentially increasing profile demonstrating the largest efficiency improvement.

Photovoltaic-Thermal Collector System for Domestic Application

2006 ◽  
Vol 129 (2) ◽  
pp. 205-209 ◽  
Author(s):  
T. T. Chow ◽  
J. Ji ◽  
W. He
Keyword(s):  
Energy Performance ◽  
Primary Energy ◽  
Heat Energy ◽  
Solar Thermal ◽  
Test Results ◽  
Thermal Systems ◽  
Collector System ◽  
Solar Thermal Collector ◽  
Reduced Temperature ◽  
Direct Attachment

Photovoltaic-thermal (PV/T) systems integrate photovoltaic and solar thermal technologies into one single system with dual production of electricity and heat energy. A typical arrangement is the direct attachment of PV modules onto a solar thermal collector surface. For a given collector surface area, the overall system energy performance is expected higher than the conventional “side-by-side” PV and solar thermal systems. In the development of PV/T collector technology using water as the coolant, the most common design follows the sheet-and-tube thermal absorber concept. Fin performance of the thermal absorber has been identified as one important factor that affects much the overall energy performance of the collector. Accordingly, an aluminum-alloy flat-box type PV/T collector prototype was constructed and tested in Hong Kong. Our test results indicate that a high combined thermal and electrical efficiency can be achieved. The primary-energy-saving efficiency for daily exposure approaches 65% at zero reduced temperature operation. With a simple and handy design, the product is considered to be very suitable for domestic application.

Tuning the Extinction Coefficient for Direct Absorption Solar Thermal Collector Optimization

2010 ◽  
Author(s):  
Todd P. Otanicar ◽  
Patrick E. Phelan ◽  
Robert A. Taylor ◽  
Himanshu Tyagi
Keyword(s):  
Energy Conversion ◽  
Extinction Coefficient ◽  
Solar Thermal ◽  
Direct Absorption ◽  
Promising Technology ◽  
Solar Thermal Collector ◽  
Solar Thermal Collectors ◽  
Collector Efficiency ◽  
Overall Performance

Direct-absorption solar thermal collectors have recently been shown to be a promising technology for photothermal energy conversion but many parameters affecting the overall performance of such systems haven’t been studied in depth, yet alone optimized. Earlier work has shown that the overall magnitude of the extinction coefficient can play a drastic role, with too high of an extinction coefficient actually reducing the efficiency. This study investigates how the extinction coefficient impacts the collector efficiency and how it can be tuned as a function of depth to optimize the efficiency, and why this presents a unique design over conventional solar thermal collection systems. Three extinction profiles are investigated: uniform, linearly increasing, and exponentially increasing.

ANALYSIS OF THE THERMAL EFFICIENCY OF A SOLAR THERMAL COLLECTOR FOR LOW-INCOME FAMILIES

2018 ◽  
Author(s):  
Julia Maria Massareli Costa ◽  
Guilherme Viana ◽  
Vinicius Cruz ◽  
Felipe Boragina da silva ◽  
Ana Beatriz Valentin ◽  
...  
Keyword(s):  
Low Income ◽  
Thermal Efficiency ◽  
Solar Thermal ◽  
Solar Thermal Collector ◽  
Low Income Families

scholarly journals Dynamic simulation and exergetic analysis of a solar thermal collector installation

2021 ◽  
Author(s):  
David García-Menéndez ◽  
Juan Carlos Ríos-Fernández ◽  
Ana María Blanco-Marigorta ◽  
María José Suárez-López
Keyword(s):  
Dynamic Simulation ◽  
Solar Thermal ◽  
Solar Thermal Collector ◽  
Exergetic Analysis
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